Duplex plunger trench pump



Dec. 14 1926.

DUPLEX PLUNGER TRENCH PUMP Ffiled Feb. 8, 1926 itlilllllllllllllllll 2Sheets-Sheet '1 J a 1 J J12 m I.

J g 1 d E 9 I f 9 f f! 6 6 v f 0 0 f j 1M J. C. GORMAN DUPLEX PLUNGERTRENCH PUMP Filed Feb. 8, 1926 2 Sheets-Sheet a Fatented Dec. 14, 1926.

entree stares 1,611,022 Parent Germs;

farms German, or MANSFIELD, onto.

DUEL X PLUNGER FRENCH PTIMF.

Application filed February suction lift of feet, by lifting it to say,20

feet, by suction, and discharging it against a head of say feet, ifnecessary.

In pumps of this character the diameter of the pump cylinder is muchgreater than the diameter of thesuction hose, and while the velocitythrough the hose will be high, because of its small diameter, and willtherefore carry solid material, such as sand and gravel held insuspension, the velocity through the larger diameter of the cylinder isdecreased-to such an extent that it is not high enough to carry thesolid material on through the cylinder, and consequently it will settle,down in the base of the pump under the plunger, instead of passing onthrough the cylinder, with the result that such material is packed andforms an obstruction that is hit by the plunger on the down stroke,thereby bending the crank shaft. 7 l p d Another object is'to provide apump ofthe' character referred to which will rid' itself of the solidmatter that usually settles in the-base of the pump, with consequentinjury to the crank shaft and other parts of the pump, as above stated-Another object is to provide a duplex plunger pump consisting of fewparts which maybe easily assembled and which will afford easy access tothe working parts for cleansing or repairs.

The invention will first be hereinafter more particularly described,with reference to the accompanying drawings, which are to be taken as apart of this specification, and then pointed out in the claims at theend of the description. l v

In said drawings, Fig. 1 is a plan view of a duplex plunger trench pumpembodying my invention;

Fig. 2 is a verticalsectional elevation;

Fig. 3 is a vertical longitudinal sectional view taken at right anglesto the view shown in Fig. 2; and

Fig. l is an inverted plan view of the 8, 1926, Serial No. 86,8891

saucer-shaped attachment on the lower end of the plunger detached.

Referring to said drawings, in which the same reference letters are usedto denote corresponding parts in different views, the letter A denotesthe main casting or pump casing on which is mounted a crank shaft B,and-a counter-shaft G'which carry atone end intermeshing gears throughwhich motion is imparted to the crank-shitft for imparting areciprocating movement to the plungers As shown, a pinion c on thecounter-shaft engages a gear 6 onthecrankshaft B, and the counter-shaftis driven by gear connection with power engineor other driving means,for impartingthe desired rotary movement to the crank shaft and throughit a reciprocatory movement tothe plungers. Suitable bearings for theduplex crank shaft are mounted on standards A on opposite sides of themain casting andan intermediate standard A and one of the cranks at eachside of said intermediate standard is connectedin a well known'mannerwith a connecting rod D which has its lowerend pivotally securedto thesolid bottom of a hollow plunger E, of bucket-like form, in thefollowing manner. The connecting rod carries at its lower end a wristpincl which is non-rotatably secured in a bearing therefor on the bottom ofthe hol-' low plunger, said bearing consisting of alower member having adepending exteriorly threaded boss on its under side, which; is screwedinto an interiorly threaded opening in the bottom of the plunger E, andhaving on its upper side the lower half f of the wrist-pin bearing; theupper halfof said bearing comprising two caps f each having apertures inthe ends thereof which register with interiorly threaded sockets in thebase member 7, and the two parts are secured together by stud bolts orscrews f? screwed into said sockets. The wrist-pin has a tri-part sleevethereon, consisting of two outer members 7 having radial; flanges ontheir inner ends andan intermediate member fitted in the openingthroughthe lower end of the connecting rod confined beween the endflanges of the sleeve members f, so as to permit oscillatory movement ofthe rod on the wrist-pin. The plungers E are slidably fitted withincylindrical portions of the main casting A on opposite sides thereof andare guided in their up and down movements by common suction-pipeconnection 1 means of long stuffing boxes comprising packing material Gconfined in annular recesses in the inner walls of the cylindricalportions of the main casting, between said walls and the outer walls ofthe plunger, extending approximately the full length of the points ofcontact between the plungers and said cylindrical portions andapproximately the entire length'of said cylindrical portions on theinlet and discharge sides of the pump, and the packing is compressed insaid recesses by means of annular rings 9 screwed into the upper ends ofsaid cylindrical portions. I thus dispense with guides for the plungersuch as are usually employed in duplex plunger pumps as heretofore constructed. As the force of the piston stroke is exerted at the bottom ofthe plunger instead of the top the long packing around the plunger isthe only guide necessary. The main casting A has formed therein adischarge port or opening a in communication with a chamber of largecapacity formed in an elbow-shaped coupling member or cast ing H securedto the main casting A, at one side thereof; said member if being cast inone piece with a partition and discharge chamber on each side of saidpartition, both arranged to discharge into a common outletpipe-connection I, for attaching a hose or the like, and upon saidpipe-connection 7 1S placed an alr chamber K.

The discharge chambers are each provided with an outlet port Z having avalve seat on which is seated an outwardly opening discharge valve L,preferably a rubber ball, underneath a clean-out opening in the top ofthe casting which has a detachable cover M having depending fingers atto guide the valve to its seat. Inlet ports or openings (1, ofconsiderably less capacity than the discharge ports a are provided onthe opposite side of the main casting A in communication with a pipecoupling N having an inlet port formed with a valve seat on which isfitted an inwardly opening gravity-actuated valve L, preferably a rubberball, and above said valve there is a clean-out opening on which isdetachably secured a cap or cover M having fingers m which serve asguides for the valve and hold it in proper seating position when raisedby the incoming fluid. The inlet valves are in direct communication witha Each plunger has rigidly secured thereto on its under side an invertedsaucer-shaped device O, which has at one side an opening 0, whichextends from a point about its center to its circumference and itswedge-shaped form adapts it to direct any solid material, such as sandand gravel, inwardly toward the center line of the cylinder, and on thedown stroke of the piston or plunger such material is forcibly movedinwardly toward said center line and thence outwardly along the'openside 0 toward and into the discharge chamber, thus keeping the pump freefrom solid material and greatly facilitating the discharge of sanddadenor gravel-laden water. under side or bottom of the plunger by means ofset screws or other fastening means, or it may be formed as an integralpart of said bottom.

A pump constructed as de cribed will do the work that has heretoforeordinarily been done by using two diaphragm pumps, as when there is avolume of water of say 10,000 gallons per hour to be handled at a headof feet, the diaphragm pump which is ordinarily used will not take careof such conditions, because 30 feet is beyond the suction limit of thepump, and if a centrifugal pump of lar e capacity is used it will handle15,000 gallons per hour and upwards, and with only small volume to bepumped, it would quickly lose its prime, as it would pump the waterfaster than it flows into the excavation and therefore, where air wouldenter the suction line, causing it to lose its prime. On the other hand,the plunger pump will pump air and water at the same time up to asuction lift of 20 feet and will, therefore, keep the water pumped downwithout losing its prime.

My improved pump is designed to fill the gap between the diaphragm pump,which is only good for a suction lift of 25 feet, and the more expensivecentrifugal pump which it is undesirable to use for the reasonshereinbefore stated.

It will be observed that the discharge openings in the main casting areconsiderably larger than the inlet openings and open into dischargechambers of large capacity, thus giving greater freedom of movement ofthe liquid on the discharge side of the pump, and easy access isafforded to the suction and discharge valve by simply removing adetachable cover and also to the plungers, the bottoms of which areaccessible through plugs P inserted in interiorly threaded openingsthrough the bottom of the main casting.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is 1. in a duplex plungerpump, a main casting having cylindrical chambers on opposite sidesthereof and reciprocating plungels in said chambers; each chamber beingprovided with a comparatively small inlet port and with a comparativelylarge discharge port, partitioned casing members attached to said maincasting, one having a valve-controlled inlet passage and small sizedopenings communicating with said inlet ports and the other having ateach'side of its partition a discharge chamber of large capacity incommunication with one of said discharge ports and leading therefrom toThis device may be secured to the a common valve-controlled outlet ofcomparatively small size; each of said plungers being slidably fitted ina long stuffing boX extending approximately the full length .of thecylinder between inlet and discharge ports in said casting andapproximately the entire length of the points of contact between thecylinder wall and the plunger, the packing around the plunger adapted toserve as a guide therefor.

In a pump, a. reciprocating plunger having a solid bottom pivotallysecured to a connecting rod operatively connected with a crankshaft, andmeans for pivotally connecting said bottom with one end of said rod;said means comprising a wrist-pin fitted in an eye in the lower end ofsaid rod and h vin its ends secured between upper and lowerliearingmembers, the lower bearing member 11 ving on its under side anexteriorly threaded boss screwed into an interiorly threaded opening insaid bottom, and the upper bearing member consisting of. cap-pieces.arranged on opposite sides-oi the rod and having apertures thereinregistering with interiorly threaded sockets in said lower bearingmember, and fastening bolts passing through said caps and screwed intosaid sockets, whereby the wrist-pin is clamped between said caps andsaid lower i iearing member so as to permit an oscillatory movement ofthe connecting rod.

3. In a pump having a reciprocating plunger, means for preventing sandand gravel from settling in the base of the pump under the plunger, saidmeans consisting of a device on the under side of the plunger ofsubstantially saucer-shaped form inverted and having an opening on oneside thereoi extending toward the discharge opening from its center toits circumference.

4.1n a' pump having a reciprocating plunger, means for preventing sandand gravel from settling in the base of the pump under the plunger, saidmeans consisting of a device of substantially saucer-shaped forminverted and having an opening on one side thereof extending toward thedischarge opening from its center to its circnmference; said devicebeing detachably secured to the bottom of the plunger so that it may bereadily removed and replaced.

In a duplex plunger pump, a main casting having cylindrical chambers onopposite sides thereof and reciprocating plungers in said chambers eachoperatively connected with a crank-shaft, each of said chambers havingat one side an inlet opening of com parativeiy small size and at theother side a discharge opening 01. comparatively large size, partitionedcasing members attached to said main casting, one having an inletleading to openings of small size each comniiunicating with one of theinlet openings in said main casting and the other having a discl'iargechamber of large capacity on each of its partition each communicatingwith one oi said discharge openings and leading therefrom to a commonoutlet of comparatively small size, a single ball-valve controlling saidinlet passage and a single ball-valve controlling said outlet.

In testimony whereof I affix my signature.

JAMES C. GORMAN.

